Furnace



(No ModL) 2 sheets-sheet 1.

P. V. DWYER.

PURNAGE.

Patented Nov. 24, 1885-.

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(No ModeL) 2 Sheets-Sheet 2.

P. V. DWYER.

PURNACE.

N0. 330i969. Patented Nov. 24, 1885.

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PATRICK VINCENT DVYER, OF ST. PAUL, MINNESOTA.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 330,969, dated November 24, 1885.

Application filcd January 1G, 1885. Serial No. 153,106. (No model.)

To all whom it may concern:

Be it known that I, PATRICK VINCENT DWYER, a citizen of the United States, and a resident of St. Paul, in the county of Ramsey and State of Minnesota, have invented certain new and useful Improvements in Furnaces, of which the following is a specification.

Figure 1 is a sectional front elevation. Fig. 2 is a sectional side elevation. Fig. 3 is a cross-sectional View on the line y y of Fig. l. Fig. 4. is an enlarged sectional detail of portions of the upper part of the dome and one of the radiators, illustrating the manner of uniting them. Fig. 5 is a sectional rear elevation, and Fig. 6 is a cross-sectional view on the line x of Fig. 5.

A is the outer casing or shell setting upon an open base, A?, the latter supporting the usual ashpit, A3, iire-pot A4, and grate A5, as shown.

Setting upon the top edge of the iirepot A4, and rising upward therefrom,is the dome, consisting of a cylindrical wroughtiron shell or side, B, and a conical cast-iron top, B.

Partially surrounding the shell B of the dome on each side are two hollow radiators, consisting of wrought-iron sides C C', and castiron tops or heads C2 C2, and with hopper or funnel7 shaped cast-iron bottoms G3 O3, the latter ending in mouths a. a', fitting into short tubes b b', rising from the sides of the ash-pit A3, as shown. By means of these funnel-shaped bottoms and the tubes b b all the ashes, dust, &c., which are carried into the radiators will be conveyed into the ash-pit, as hereinafter shown. At their rear edges the radiators are as close together as it is possible to arrange them and still have them separated, and at their front edges they are as close together asthe presence of the fuel-door D will permit them to be placed, or, in other Words, the radiators occupy all the available space surrounding the shell B of the dome, so as to make them as large as possible.

E E2 E3 E4 are four tubes connecting the top B2 of the dome with the ends of the tops C2 C2 of the radiators, as shown, through which tubes all the smoke, gas, and other products of the combustion rising from the fuel in the lire-pot A4 passes to the radiators. At their rear sides the funnelshaped bottoms C3 Cf are connected together by a horizontal tubular section, C", from thecenter of which the smokeexit flue C5 leads through the casing A'. By this arrangement all the smoke, gas, dmc., and their accompanying heat rise up into the dome B B2 and pass through the tubes E E2 E3 E4 down into the radiators, and thence out through the exit-flue C5. that the exit-flue C5 is about on a line even with the top of the fire-pot A4. By this arrangement I am enabled to retain the gas, smoke, &c., for a longer period of time in the radiators,and thus insure the radiation of a greater quantity of the heat and utilize to the fullest possible extent all the products of combustion. Spaces of from two and one- It will be observed half to five inches, according to the size of the I furnaces, are left between the radiators and the shell A, and between the radiators and the dome, up through which the air is drawn by the action of the heat radiated from the i dome and radiators, and discharged through thehot-air pipes F in the ordinary manner. The courses of the smoke, gas, Ste., and also the airvcurrents, are indicated by arrows in the different gures of the drawings.

I attain several very important advantages by the manner shown of constructing the radiators. First, by making the radiators in two distinct parts and connecting each part to the dome by its own independent set of tubes El E2 and E3 Et the heat, smoke, gas, &c.,

pass to each radiator in equal quantities, so that the hea-t is radiated uniformly from both sides of the furnace; secondly, I attain a great advantage by the construction of the radiators with the funneleshaped bottoms C, since by this means all the ashes, dust, 8m., which settle in the radiators fall of their own volition into the funnel-shaped bottoms, and from thence into the ash-pit A, thirdly, the funnel shape of the bottoms of the radiators prevents the accumulation of dust and ashes therein, which would choke them and interfere with their efficiency. Tight-tting dampers d di will be arranged in the lower parts ofthe ,funnel-shaped bottoms C3, to close communication between the tubes b and the radiators,

to prevent air-currents passing up into the radiators from the ash'pit and checking the draft. The dampers d cl2 also perform two othervery important functions-viz., by opening them a check-draft is formed between the IOO is found in the manner of arranging the tubesl E El E3 E4, by leading them vall to the center of the conical top B`l of the dome, as I thereby obtain a much more extended heating-surface 1 than could be obtained if the tubes connected the dome and radiators directly, and at as short a distance as possible.

I have stated above that the shell B of the dome and the body parts C of the radiators i are ot' Wrought-iron, while their tops and the funnel-shaped bottoms are of cast-iron; but all the parts may be of wrought-iron or cast-iron, if preferred. Generally, however, it will be y betterto construct them partially of wrought- 'iron and partially of cast-iron, as described and-shown, as the thin wrought-iron permits a more free radiation than the necessarily thick er castiron.

All the Vjoints will be cemented together, so

' .das to make them gas and dust tight.

The connecting-tube C4 may be cast in one piece with the radiator, or separately, as preferred.

The manner of forming thejoint between the radiator shell C and the funnel-shaped loottoms C3 is another feature of rny` invention, and rconsists in forming on the upper edges of the bottoms C3 an inwardly and upwardly inclined rib or rim, and flaring the lower edge of the radiator C outward and downward to lit tightly over it. By this means-atight joint is insured and its closeness increased by the weight of the radiator and dome-top. 'Thus a very easily-made and at the saine time efficient joint is secured. This form of `joint also allows for unequal expansion and contraction of the different metals without danger of the opening of the joints.

Having thus described my invention, what I claim as new is* 1. In a hotair furnace, an outer casing, A', having fresh-air inlets and hot-air iues leading therefrom, a fire-pot, A4, ash-pit A3 beneath said fire-pot, and dome B', rising from said re-pot, in combination with radiators C C', surrounding said dome and iire-pot, within the outer casing, whereby airspaces are formed between the radiators and the outer casing and between the radiators and the dome and fire-pot, radiating tubes or iiues E E2 E3 E4 leading from the center of the dome to the radiators, atubular section, Ct, connecting the lower ends of the radiators, and an exitsubstantially as set forth.

2. In a hot-air furnace, an ash-pit, a firepot municating with said dome at their upper ends,

said radiators beingformed with funnel-shaped bottoms which communicate with said ashpit, dampers which close said bottoms, and an eXit-iiue communicating with the lower ends of said radiators,substantially as set forth. 3. In a hot-air furnace, a fire-pot, A4, anda dome consisting of a shell, B', and top B2, the latter having tubes E El E3 E* radiating from the center thereof and cast in one piece therewith,in combination with radiators C G, having cast-iron tops C2 C2, which communicate with said tubes E E2 E3 E4, and cast-iron bottoms C3 C?, a tubular section, C4, connecting said bottoms, and an eXit-lue,C5,communicat ing with said section, substantially as set forth. In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

PATRICK VINCENT Dw'YRR. y

Witnesses: I

C. N. WooDwARn, FRANK P. BLAIR. 

